BBR 88cc Flat Top Piston Big Bore Kit
BBR 88cc Flat Top Piston Big Bore Kit is backordered and will ship as soon as it is back in stock.
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Item Fitment
Item Fitment
BBR 88cc Flat Top Piston Big Bore Kit - confirmed fit on the following bikes.
Shipping & Taxes
Shipping & Taxes
We pride ourselves on fast shipping on all orders. Orders placed before 5PM EST will ship the same day Monday - Friday (excluding holidays, and the occasional day off for riding).
US Customers - Taxes (if applicable) will be charged at checkout.
International Customers - Duties/Taxes will be paid at the time of delivery (not checkout).
Description
Description
Convert your CRF/XR50 to an 88cc screamer with this complete kit. Everything is included to upgrade the performance of you mini-bike. This kit uses your stock CRF/XR50 cylinder head.
Also fits 1988-1999 Z50R with short piston.
- Aluminum BBR cylinder
- Special 52mm piston specially designed to work with your stock cylinder head's combustion chamber
- BBR special grind camshaft take full advantage of the large piston for great performance
- Special BBR tapered aluminum intake manifold adapts the large carb to the stock intake port size
- 18mm carb includes extra main and pilot jets for easy tuning
- Also includes CR style throttle, cable, air filter and top end gasket kit
Installation Note 1: Throttle unit included with kit will only work with 7/8" handlebars and will not mount to stock XR/CRF50 handlebars. Stock handlebars are 3/4".
Installation Note 2: This kit will not work with the Honda XR/CRF70 or other big port cylinder heads. It is designed for the tiny combustion chamber of the OEM Honda XR/CRF50 cylinder head. The flat top piston dome will result in an extremely low compression ratio when combine with the XR/CRF70 type cylinder head. The result is a motor that makes less horsepower than stock. Click this link for the BBR bore kit for the CRF/XR70.
BBR General Jetting Guidelines Chart
